a brand new clip from their sit down with cbs' steve croft for "60 minutes" this sunday. >> why did you want to do this, a joint interview? >> the main thing, i wanted to have a chance to publicly say thank you. i think hillary will go down as one of the finest secretary of states we've had. it has been a great collaboration over the last four years. i'm going to miss her. wish she was sticking around. but she has logged in so many miles, i can't begrudge her wanting to take it easy a little bit. i want the country to appreciate just what an extraordinary role she's played during the course of my administration, and a lot of the successes we've had internationally have been because of her hard work. >> a few years ago, it would have been seen as improbable, because we had that very long, hard primary campaign. but, you know, i've gone around the world on behalf of the president and our country. and one of the things that i say to people, because i think it helps them understand, i say, look, in politics and in democracy, sometimes you win elections, sometimes you lose elections and i wo